1. International Food Policy Research Institute (IFPRI), Cairo, Egypt;
2. International Institute of Tropical Agriculture (IITA), Nairobi, Kenya
3. International Food Policy Research Institute (IFPRI), Washington, DC, USA
4. CGIAR Standing Panel on Impact Assessment, Rome, Italy
5. Department of Agricultural and Consumer Economics, University of Illinois at Urbana-Champaign, Urbana, Illinois, USA
6. Charles H. Dyson School of Applied Economics and Management, Cornell University, Ithaca, New York, USA